Tests

Question 1

Lithium- li+

Answer 1

FLAME TEST

1. Put platinum wire loop in hcl and then in hold under a flame until it burns with no colour.
2. put in substance- flame- CRIMSON-RED

Question 2

Sodium na+

Answer 2

FLAME TEST

1. Put platinum wire loop in hcl and then in hold under a flame until it burns with no colour.
2. put in substance- flame- YELLOW-ORANGE

Question 3

Potassium k+

Answer 3

FLAME TEST

1. Put platinum wire loop in hcl and then in hold under a flame until it burns with no colour.
2. put in substance- flame-LILAC

Question 4

Calcium ca2+

Answer 4

FLAME TEST

1. Put platinum wire loop in hcl and then in hold under a flame until it burns with no colour.
2. put in substance- flame- BRICK-RED

Question 5

Copper2 cu2+

Answer 5

COLOURED PRECIPITATE WITH NAOH.

1. many metal hydroxides are insoluble and precipitate out of solution when formed
2. Add NaOH a coloured insoluble hydroxide forms- BLUE
3. cu2+(aq) + 2OH- (aq)= cu(OH)2 (s)

Question 6

Iron 2 fe2+

Answer 6

COLOURED PRECIPITATE WITH NAOH.

1. many metal hydroxides are insoluble and precipitate out of solution when formed
2. Add NaOH a coloured insoluble hydroxide forms- SLUDGY GREEN
3. Fe2+(aq) + 2OH- (aq)= Fe(OH)2 (s)

Question 7

Iron 3 Fe 3+

Answer 7

COLOURED PRECIPITATE WITH NAOH.

1. many metal hydroxides are insoluble and precipitate out of solution when formed
2. Add NaOH a coloured insoluble hydroxide forms- REDDISH BROWN
3. Fe3+(aq) + 3OH- (aq)= Fe(OH)3 (s)

Question 8

Ammonium inos NH4 +

Answer 8

ADD NAOH

1. add it to a test tube of compound
2. DAMP RED litmus paper will turn BLUE as ammonia gas is given off.

Question 9

Carbonates co3 2-

Answer 9

ADD HCL and CARBON DIOXIDE will be released- test with lime water
2. CO3 2-+ 2H+= CO2 +H20

Question 10

Sulfates so4 2-

Answer 10

ADD HCL AND BARIUM CHLORIDE

1. add HCL to remove any traces of carbonates of sulfite ions
2. then add barium chloride- a WHITE PRECIPITATE will form
3. BA 2+ + SO4 2-= BaSO4

Question 11

Chloride ion

Answer 11

add NITRIC ACID and SILVER NITRATE

1. AG+ + cl- =agcl - A WHITE PRECIPITATE OF SILVER CHLORIDE

Question 12

Bromide ions

Answer 12

add NITRIC ACID and SILVER NITRATE

1. AG+ + Br- =agbr - A CREAM PRECIPITATE OF SILVER BROMIDE

Question 13

iodide ions

Answer 13

add NITRIC ACID and SILVER NITRATE

1. AG+ + I- =agI - A YELLOW PRECIPITATE OF SILVER IODIDE